Sending stock to Amazon.fr, should I use GB or EU EORI, or both?

Hello

I’ve sent my first stock to Amazon.fr, however, without thinking (until now) I used my GB EORI number. Thankfully the stock arrived without issue and has been received in full.

Should I have used my EU EORI, or should both be included on commercial invoice, GB as sender, and EU as receiver? If either of the above are true, how did only using my GB EORI still managed to get delivered, and will I be paying a price in some way?

Also what reasons for export do you guys use please? I used ‘IntraCompanyTransfer’.

Thank you